feat: migrate to mise for unified tool management (#309)

scripts/cleanup-old-version-managers.sh

@@ -36,6 +36,7 @@ remove_dir()
     rm -rf "$dir"
     msgr run_done "Removed $label"
   fi
+  return 0
 }
 
 remove_file()
@@ -48,6 +49,7 @@ remove_file()
     rm -f "$file"
     msgr run_done "Removed $label: $file"
   fi
+  return 0
 }
 
 msgr msg "Cleaning up old version manager installations..."
@@ -133,4 +135,4 @@ if command -v brew &> /dev/null; then
   done
 fi
 
-msgr yay "Cleanup complete! Run 'mise install' to set up tools via mise."
+msgr yay "Cleanup complete! Run 'mise install' to set up tools via mise."